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Interstate 70 in Utah
Interstate 70 (I-70) is a mainline route of the Interstate Highway System in the United States connecting Utah and Maryland. The Utah section runs east–west for across the central part of the state. Richfield is the largest Utah city served by the freeway, which does not serve or connect any urban areas in the state. The freeway was built as part of a system of highways connecting Los Angeles and the northeastern United States. I-70 was the second attempt to connect southern California to the east coast of the United States via central Utah, the first being a failed attempt to construct a transcontinental railroad. Parts of that effort were re-used in the laying out of the route of I-70.
Unlike most Interstate Highways, much of I-70 in Utah was not constructed parallel to or on top of an existing U.S. Highway. Portions of I-70 were constructed in areas where previously there were no paved roads. Because it was built over an entirely new route, I-70 has many features that are unique in the Interstate Highway System. For example, the between Green River and Salina makes up the longest distance anywhere in the Interstate Highway System with no motorist services. This same piece is noted as the longest highway in the United States built over a completely new route since the Alaska Highway, and the longest piece of Interstate Highway to open at a given time. The construction of the Utah portion of I-70 is listed as one of the engineering marvels of the Interstate Highway System.
The choice of the route had a significant impact on the character and culture of the Sevier Valley. It has also been a motivating factor for environmentalists to create a new National Park along the path of the highway to protect scenic areas around the route. I-70 from Green River to Grand Junction, Colorado is part of the Dinosaur Diamond Prehistoric Highway, making I-70 one of the few Interstate Highways to be named a National Scenic Byway. Attractions listed by the Federal Highway Administration for the Dinosaur Diamond Prehistoric Highway on or near I-70 include, Arches National Park, Canyonlands National Park, Cleveland-Lloyd Dinosaur Quarry, Goblin Valley State Park and Westwater. The designation lists several side roads branching from I-70 that lead to dinosaur bones or footprints.
==Route description==
I-70 begins at a trumpet interchange with Interstate 15, near Cove Fort. It then proceeds east over the Pavant Range, cresting at an unnamed summit with an elevation of . The eastern descent from the Pavant range features bridges high above Clear Creek and its side canyons. The longest of these bridges is the Fish Creek bridge at long.〔 Note: (alternate site ) for data〕 The descent into Clear Creek features a brake check area and runaway truck ramp to aid truckers down the steep slope. The freeway then skirts the edge of Fremont Indian State Park before entering Sevier Valley.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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